Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Control system for permanent magnet synchronous motor










Image Number 14 for United States Patent #5854547.

To provide a control system for a permanent magnet synchronous motor which can ensure stability of the current control system, even if the revolution frequency of the motor becomes higher and the terminal voltage of the motor exceeds the inverter maximum output voltage. In this method, when the revolution frequency of the motor exceeds a specified value, the size of the voltage vector is made a specified voltage vector, and a modulation factor based on its value is obtained. At the same time, a magnetic flux direction current correction value is found based on the size of a voltage vector from a polarity coordinates conversion unit and the above specified voltage vector size. Then, the magnetic flux direction current instruction is corrected by that value.








 
 
  Recently Added Patents
Antisense modulation of C-reactive protein expression
Interleaving charge pumps for programmable memories
Using sets of OTDR receive fibers with different lengths of marker events to verify optical fiber connectivity
Method of manufacturing nitride semiconductor and nitride semiconductor element
Frequency offset estimation apparatus and method of OFDM system
Mobile interactive kiosk method
Valved, microwell cell-culture device and method
  Randomly Featured Patents
Network-based system for configuring a programmable hardware element in a system using hardware configuration programs generated based on a user specification
Platform lifting mechanism provided with a driving pulley and corresponding driving system
Method for the preparation of .alpha..sup.1 [[(1,1-dimethylethyl)amino]methyl]-4-hydroxy-1,3-benzenedimethanol
Failure resistant multiline tether
Camera including first, second and third exterior members defining the exterior thereof
Scattering diagrams in seismic imaging
Electrical feedthrough structure and fabrication method
Human brain sodium dependent inorganic phosphate cotransporter assay
Card handling device
Dynamic type memory